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Entomological Investigations in New Guinea Mountains1 Vol. XVI, No. 1# July, 1956 47 Entomological Investigations in New Guinea Mountains1 J. L. Gressitt BERNICE P. BISHOP MUSEUM HONOLULU, HAWAII (Presented at the meeting of December 12, 1935) This is a preliminary report on my first trip to New Guinea. Since it is made before study of any of the material collected, and before identification of most of the host-plants, it consists mainly of notes on the environment and col lecting in the areas visited. The trip was made possible by a John Simon Guggenheim Memorial Foundation Fellowship. I spent from June 5 to September 25, 1955, in New Guinea and New Britain. The objectives of the trip were (1) to collect insects primarily in new or relatively uncollected mountain areas in the interior of New Guinea in order to gather more data towards an understanding of the zoogeography of New Guinea insects, (2) to obtain material to be used in comparative studies in aiding the col laborators of the Insects of Micronesia series to identify Micronesian genera and to help them to work out the zoogeography of the Micronesian insect groups they are studying, and (3) to help develop a representative collection from the Papuan area at Bishop Museum towards an understanding of the source-areas of the oceanic Pacific insect fauna. It is assumed that much of the oceanic Pacific insect fauna originated from the major islands stretching between the Solomons and southeast Asia, per haps in the main from New Guinea, eastern Indonesia and the southern Philippines. Since rather little insect collecting has been done in the high mountain areas of most parts of New Guinea, I spent most of my time in the moun tains. The principal insect collecting in New Guinea has been in the coastal areas or mountains along the north coast, as well as in the extreme west end (Vogelkop) and in scattered parts of Papua. The most extensive entomolog ical survey in the interior was made by L. J. Toxopeus (Proc. Eighth Int. Congr. Ent. 508-522,1950) and his staff on the Third Archbold Expedition (Netherlands Indian-American Expedition) during 1938-39, when collecting was done systematically at all altitudes from just above sea level to nearly the highest altitudes in westcentral New Guinea (eastcentral Netherlands New Guinea), from the Mamberamo River where it reaches the lowlands, southwest to the Mt. Wilhelmina area in the Snow Mountains. Other ex- 1 Partial results of a John Simon Guggenheim Memorial Foundation Fellowship, 1955-56. Revision of Presidential Address, December, 1955. 48 Proceedings, Hawaiian Entomological Society tensive mountain collections were made by Miss Evelyn Cheesman at Ko- koda on the Owen Stanley Range in 1933, and in other mountains such as the Cyclops Mountains (1936) near the north coast of the central portion, and Waigeo (1938); by C. T. McNamara on Mt. Lamington (near Kokoda) in 1929; by the Second Archbold Expedition in the Upper Fly River area of western Papua in 1936-37; by P. J. Darlington in the northeast in 1944-45; by E. O. Wilson in eastern New Guinea in 1955, and others. Most other collecting has been in lowland areas, except some done recently by J. J. H. Szent-Ivany. With the expectation of further trips to the New Guinea area (now assured by invitations from the Departments of Agriculture of the Territory of Papua and New Guinea and of the British Solomon Islands Protectorate, and a grant from the National Science Foundation), I decided on this first trip to visit several widely separated areas at different altitudes, in order to obtain as broad a sampling as possible, at the same time collecting in new or little- collected areas. The planning and arranging of my trip was very materially aided by the suggestions of Drs. J. J. H. Szent-Ivany, H. Boschma, M. A. Lieftinck, and L. B. Holthius. Extensive assistance in the field was rendered by the depart ments of agriculture of the Territory of Papua and New Guinea, and of Netherlands New Guinea, and especially by Dr. J. J. H. Szent-Ivany, Mr. J. S. Womersley, Mr. L. A. Bridgeland, Dr. F. C. van Loenen, Mr. R. T. Simon Thomas, and Mr. R. den Haan. Further help was given by Ian Downs, G. P. Keleny, R. S. Carne, J. Sharp, Fr. M. E. Bodnar, Fr. J. Labor, F. Pemble- Smith, F. Shaw Meyer, Dr. and Mrs. A. Handsoo, A. J. Slatter, K. R. Gorringe, the South Pacific Lumber Co., W.J. Hughes, Mr. Wyttewaall, Mr. Veldkamp, L. E. Laurens, Rev. and Mrs. Troutman, L. Pospisil, and many others. Assistance in collecting was obtained locally in each area. Dr. Szent-Ivany accompanied me during my first 12 days, and loaned me his assistant, Edmund, for the following week. Mr. Simon Thomas accompanied me during my month in Netherlands New Guinea. In order to supply material to all collaborators on the Insects of Micro nesia project, all groups of insects and other terrestrial arthropods were collected. Emphasis was placed on the insect groups better represented in Micronesia: Coleoptera, Homoptera, Heteroptera, small moths, and other small insects. Since many of these are nocturnal, special emphasis was placed on light-trapping. Much general sweeping and beating was done, and also considerable Berlese-funneling. The light trap and Berlese-funnel were of the same types as used in Micronesia (Insects of Micronesia 1:202, 1954). Nets used were primarily heavy sweeping nets, a collapsible-frame beating sheet, improvised beating sheets (fig. 9c), butterfly net, water net, and or gandie net. Little emphasis was placed on butterflies, since they have been better collected than other groups and are poorly represented in Micronesia. Vol. XVI, No. 1, July, 1956 49 The general areas visited during the trip were the Port Moresby area in Papua, the "Eastern" and "Western Highlands" of northeast New Guinea, the Lae area of the Huon Gulf, Hollandia, Biak Island, the Wisselmeren (Wissel Lakes) area of westcentral Netherlands New Guinea, and the Gazelle Peninsula of Northeastern New Britain. Collecting was done at all altitudes from sea level to 4,600 meters, although no insects were taken above 4,200 meters. Papua My trip commenced at Port Moresby, Papua, June 5, 1955. Here the climate is quite dry for New Guinea, with only 1,000 mm. of rain per year, and average humidity of 60-95 per cent. In this dry area Eucalyptus trees are dominant, and the fauna is atypical for New Guinea, with Australian types predominating. The widespread Oecophylla ants are numerous among the Eucalyptus trees. Two days were spent with arrangements and procuring equipment, and two days were spent collecting at Bisianumu, alt. 500 meters, at edge of foothill rainforest in a rubber-growing region. Here rainfall is about 2,500 mm. per year and vegetation is lush jungle. At the Rubber Experiment Station, many kinds of insects were collected on flowering Crotalaria, grown as a cover crop. Several kinds of cerambycids and weevils were found ovipositing on Hevea rubber bud stock. A Pantorhytes (a genus which includes serious pests of cacao) weevil was found in jungle. Bisianumu was again visited September 23-24. A short stop was made at the Brown River, also near Port Moresby. Northeast New Guinea Highlands The second destination was Goroka, in the Eastern Highlands of North east New Guinea, by air via Wau. Goroka is in the Asaro Valley, at 1,550 meters, southeast of Mt. Wilhelm, and east of the Wahgi and Chimbu valleys. The Asaro is wide, flat, and grassy, with forested ranges over 3,000 meters high on each side. It drains into the Purari River, to the Gulf of Papua. At Goroka interesting telephorids, weevils, and chrysomelids were found on introduced ornamental plants, vegetables, sugar cane, Pipturus, and others. A Coptorrhynchus weevil had just become a pest of coffee, and a melolonthid and ants were causing injury to airstrips. Casuarina, bamboos, Eucalyptus deglupta Blume, and other plants present were possibly introduced by the natives. Poinciana was found crowded with elephant beetles, and Papuana dynastids were taken in the light trap. The next locality (June 11-16) was Daulo Pass, northwest of Goroka, on the Chimbu-Asaro Divide, at 2,450 meters, with the ridge going higher in both directions. Collecting was done up to 3,000 meters. Moss forest included small Pandanus, Freycinetia, small bamboos, Nothofagus, lianas, and Rhododendron, among a very rich variety of vegetation. A tall apparently 50 Proceedings, Hawaiian Entomological Society Vol. XVI, No. 1, July, 1956 51 semi-cultivated Pandanus with long red fruit grows near the villages. Though the weather was cool, insects were abundant. Many moths flew at night as it generally rained in afternoon and evening. Two male hercules moths were taken by Dr. Szent-Ivany. Rainfall is probably over 3,000 mm. per year. After returning to Goroka, I went to Mr. Otto (June 20-24) on the east side of the Asaro Valley. The east rim at this point is higher, overlooking much of the ridge on the west side of the valley. The upper portions of the ridge are largely covered with moss forest. Parts of the highest peaks (3,300 m.) are grassy, the result mainly of fires kindled by native hunters to warm themselves, or to provide hunting places. Tree kangaroos and other marsupials and some rodents occur in these situations. I camped on the lower side of the mountain, at Kabebe village, at 2,100 meters. Collecting was done on the main ridge, and also lesser ridges to the west, just north of the village. The area was largely forested, with some new or old clearings, mostly for sweet potato, with Pandanus near the village.
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